He didn't escape, he sentence was reduced from 8 to 3 1/2 by a Swiss judge. The reasoning was that his mental state was properly accounted for. Who knows if lobbying from Russia played a part in that. Also, not only did he face no consequences at home, he was celebrated and given a high-level job.

Maybe it's my American-ness showing, but it's pretty shocking to me that 8 years was considered too harsh for someone who stabbed a man to death in front of his family.

On the other hand, I suppose one could argue that the perpetrator was highly unlikely to commit a similar act in the future, if only because his motivation was the death of his own family, who would no longer be around to inspire him to violence a second time.